Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe2O3: How Does Ti4+ Improve Photoelectrochemical Activity?

Wu, Yi; Guo, Wei; Mishra, Mrinalini; Huang, Yann-Chang; Chang, Jeng Kuei; Lee, Tai Chou

doi:10.1021/acsanm.8b00316

Cited by 12 publications

(3 citation statements)

References 53 publications

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“…Both samples show XPS survey spectrum in Figure S2 for annealed hydrothermal nanorods with and without blocking layer show that the structures are composed of Fe and O, with small traces of C. Figure 5b shows the high resolution XPS spectra for Fe for the above mentioned samples. Both samples show two distinct Fe 2p 1/2 and Fe 2p 3/2 peaks at 724.5 and 711.1 eV, respectively [52]. The satellite peak at 720 eV is characteristic of Fe 3+ in Fe 2 O 3 [53].…”

Section: Resultsmentioning

confidence: 92%

“…two distinct Fe 2p1/2 and Fe 2p3/2 peaks at 724.5 and 711.1 eV, respectively [52]. The satellite peak at 720 eV is characteristic of Fe 3+ in Fe2O3 [53].…”

Section: Resultsmentioning

confidence: 96%

“…So in the synthesized layer, electron-hole recombination competes with charge separation and at low external bias the probability of recombination is increased. By increasing the applied potential, this undesired recombination will be decreased and the beneficial effect dominates [52]. Evidently, by using the blocking layer, less FTO is exposed to the electrolyte and therefore less reaction sites for electron back injection are available, and also the dark (leakage) current is decreased [36].…”

Section: Resultsmentioning

confidence: 99%

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Fe2O3 Blocking Layer Produced by Cyclic Voltammetry Leads to Improved Photoelectrochemical Performance of Hematite Nanorods

et al. 2019

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Hematite is a low band gap, earth abundant semiconductor and it is considered to be a promising choice for photoelectrochemical water splitting. However, as a bulk material its efficiency is low because of excessive bulk, surface, and interface recombination. In the present work, we propose a strategy to prepare a hematite (α-Fe2O3) photoanode consisting of hematite nanorods grown onto an iron oxide blocking layer. This blocking layer is formed from a sputter deposited thin metallic iron film on fluorine doped tin oxide (FTO) by using cyclic voltammetry to fully convert the film into an anodic oxide. In a second step, hematite nanorods (NR) are grown onto the layer using a hydrothermal approach. In this geometry, the hematite sub-layer works as a barrier for electron back diffusion (a blocking layer). This suppresses recombination, and the maximum of the incident photon to current efficiency is increased from 12% to 17%. Under AM 1.5 conditions, the photocurrent density reaches approximately 1.2 mA/cm2 at 1.5 V vs. RHE and the onset potential changes to 0.8 V vs. RHE (using a Zn-Co co-catalyst).

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Section: Resultsmentioning

confidence: 92%

“…two distinct Fe 2p1/2 and Fe 2p3/2 peaks at 724.5 and 711.1 eV, respectively [52]. The satellite peak at 720 eV is characteristic of Fe 3+ in Fe2O3 [53].…”

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Fe2O3 Blocking Layer Produced by Cyclic Voltammetry Leads to Improved Photoelectrochemical Performance of Hematite Nanorods

et al. 2019

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Solar‐Driven Photoelectrochemical Upcycling of Polyimide Plastic Waste with Safe Green Hydrogen Generation

Zhao,

Zhang

et al. 2024

Advanced Energy Materials

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Arbitrary disposal of plastic waste into landfills and oceans can disturb the ecological system and even challenge human survival. Centralized plastic recycling process only works for selected types of plastics (e.g., polyethylene) with limited contribution (<10%), because of high infrastructure requirement. Comparatively, photoreforming of plastic waste for commodity and fuels production is much more facile and decentralizable, and thus holds great potential to mitigate the plastic waste challenge. To this end, a fully solar powered photoelectrochemical system is developed to selectively upgrade polyimide waste (often appears in electronic waste) into valuable commodity chemicals, including succinic acid, acetic acid, and formic acid, and cogenerating green hydrogen fuels. It is also demonstrated that one of the key monomer, pyromellitic acid, and the precious metals (in electronic waste) can be fully recycled. This proof‐of‐concept demonstration provides a new viewpoint for designing decentralized photoelectrochemical system for simultaneous plastic waste upcycling and renewable fuel synthesis, critical for a sustainable plastic economy. Selective cleavage of benzene ring also opens a green route for other benzene ring‐containing waste upgrading.

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Photoelectrochemical water oxidation of surface functionalized Zr-doped α-Fe2O3 photoanode

Ramachandran,

Stanleydhinakar,

Navaneethan

et al. 2024

J Mater Sci: Mater Electron

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Combinatorial Studies on Wet-Chemical Synthesized Ti-Doped α-Fe₂O₃: How Does Ti⁴⁺ Improve Photoelectrochemical Activity?

Cited by 12 publications

References 53 publications

Fe2O3 Blocking Layer Produced by Cyclic Voltammetry Leads to Improved Photoelectrochemical Performance of Hematite Nanorods

Fe2O3 Blocking Layer Produced by Cyclic Voltammetry Leads to Improved Photoelectrochemical Performance of Hematite Nanorods

Solar‐Driven Photoelectrochemical Upcycling of Polyimide Plastic Waste with Safe Green Hydrogen Generation

Photoelectrochemical water oxidation of surface functionalized Zr-doped α-Fe2O3 photoanode

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